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If you do it yourself put the car on a ramp and remove belly pan. Drain plug will be on passenger side of radiator. Takes a while to drain. Did my friends 750. And I had to do mine when I installed new ALTERNATOR.

yeah its super easy i wouldnt waste money taking it to an INDY. Just lift front side of the car remove the belly pan as stated before, they wll be a screw with ridges on it on the passenger side and connected to it is like a faucet knob looking thing where the coolant will come out of. Put a pan directly under that and turn the ridge looking screw till you see a full stream of coolant, Let that drain for a good 30-40 min and go have a couple beers. Come back screw the pin back shut, fill up the reservoir with coolant, then after that massage the lower,upper radiator hose and any other hose that has coolant flowing through it for a minute or two, you should hear it gurgling as air is released from the system, now you should be able to pour more coolant into it, after you top it off again, go into the car put the car into the accessory position, turn AC on and turn the heat to 90 on both sides but keep the fans as low as possible for about a minute or two, you will hear more gurgling coming from the reservoir. After that check reservoir, fill again if needed, turn car on, let it run for a minute or two and then put the cap back on and your done! Check level again when car is dead cold and top off to max line. Hope this helps!

Ok I agree lol what he explained is very easy but how about all the coolant that stays in the engine I was doing my friends e38 not a while ago what ever I drained from radiator was only half coolant that is in the system. So if ur only doing half job what's the point. They had couple diy for e38. I don't see any for e 65/66.

What kind of antifreeze you put in doesnt mAtter, as long as its not dexcool orange stuff, regular green stuff is fine, keif posted a while back approved antifreeZe from bmw and the green stuff qualified. But to each its own, ive used the green for 50k miles with no prob.

A sidenote -- unlike most other cars, this car's setup is self-bleeding. As muggzy said, turning on the heater is all you need to do to open all passages.

For bleeding/venting, there is a thin hose going from the driver's side of the radiator across to the coolant reservoir (constantly bleeds the system), and a vent hose from the two heads over to the coolant reservoir (which I'm guessing is at the top of the system).

+1 / muggzy. I use the normal green stuff too, no issues; all the fluids I've bothered to look at meet BMW specs.

A sidenote -- unlike most other cars, this car's setup is self-bleeding. As muggzy said, turning on the heater is all you need to do to open all passages.

For bleeding/venting, there is a thin hose going from the driver's side of the radiator across to the coolant reservoir (constantly bleeds the system), and a vent hose from the two heads over to the coolant reservoir (which I'm guessing is at the top of the system).

+1 / muggzy. I use the normal green stuff too, no issues; all the fluids I've bothered to look at meet BMW specs.

Keif good too know thx. But when changing coolant and u drain it from radiator plug at the bottom it's only part of ur coolant system right? What about the rest in the engine and stuff